Metal oxide particles containing titanium oxide coated with silicon dioxide-stannic oxide complex oxide

Abstract

A metal oxide particle containing titanium oxide coated with silicon dioxide-stannic oxide complex oxide including: a titanium oxide-containing core particle (A); and a coating layer with which the titanium oxide-containing core particle (A) is coated and that is made of silicon dioxide-stannic oxide complex oxide colloidal particles (B) having a mass ratio of silicon dioxide/stannic oxide of 0.1 to 5.0, wherein one or more intermediate thin film layers that are made of any one of an oxide; a complex oxide of at least one element selected from the group consisting of Si, Al, Sn, Zr, Zn, Sb, Nb, Ta, and W; and a mixture of the oxide and the complex oxide are interposed between the titanium oxide-containing core particle (A) and the coating layer made of the silicon dioxide-stannic oxide complex oxide colloidal particles (B).

1 . A metal oxide particle containing titanium oxide coated with silicon dioxide-stannic oxide complex oxide comprising:
 a titanium oxide-containing core particle (A); and   a coating layer with which the titanium oxide-containing core particle (A) is coated and that is made of silicon dioxide-stannic oxide complex oxide colloidal particles (B) having a mass ratio of silicon dioxide/stannic oxide of 0.1 to 5.0, wherein   one or more intermediate thin film layers that are made of any one of an oxide; a complex oxide of at least one element selected from the group consisting of Si, Al, Sn, Zr, Zn, Sb, Nb, Ta, and W; and a mixture of the oxide and the complex oxide are interposed between the titanium oxide-containing core particle (A) and the coating layer made of the silicon dioxide-stannic oxide complex oxide colloidal particles (B).   
     
     
         2 . The metal oxide particle containing titanium oxide coated with silicon dioxide-stannic oxide complex oxide according to  claim 1 , wherein
 a titanium oxide content in the titanium oxide-containing core particle (A) is 5% by mass to 100% by mass in terms of TiO 2 , and an amount of the coating layer made of the silicon dioxide-stannic oxide complex oxide colloidal particles (B) to a mass of the titanium oxide-containing core particle (A) is in a range of 0.01 to 1.0.   
     
     
         3 . The metal oxide particle containing titanium oxide coated with silicon dioxide-stannic oxide complex oxide according to  claim 1 , wherein
 the titanium oxide-containing core particle (A) includes at least one element selected from the group consisting of Si, Al, Sn, Zr, Zn, Sb, Nb, Ta, and W.   
     
     
         4 . The metal oxide particle containing titanium oxide coated with silicon dioxide-stannic oxide complex oxide according to  claim 1 , wherein
 a crystal type of the titanium oxide-containing core particle (A) is a rutile type.   
     
     
         5 . The metal oxide particle containing titanium oxide coated with silicon dioxide-stannic oxide complex oxide according to  claim 1 , wherein
 an organic silicon compound or an amine-based compound is bonded to a surface of the metal oxide particle.   
     
     
         6 . A dispersion sol of metal oxide particles containing titanium oxide coated with silicon dioxide-stannic oxide complex oxide comprising:
 a dispersion medium; and   metal oxide particles dispersed in the dispersion medium, wherein   the metal oxide particles are each the metal oxide particle containing titanium oxide coated with silicon dioxide-stannic oxide complex oxide as claimed in  claim 1 , and the dispersion medium is water, an organic solvent, or a mixed solvent of water and the organic solvent.   
     
     
         7 . A coating liquid for forming a transparent coating film comprising:
 metal oxide particles; and   a matrix formation component, wherein   the metal oxide particles each include the metal oxide particle containing titanium oxide coated with silicon dioxide-stannic oxide complex oxide as claimed in  claim 1 , and   the matrix formation component includes at least one selected from the group consisting of an organic silicon compound of Formula (I):
   R 1   a R 2   b Si(OR 3 ) 4−(a+b)   (I)
 
   
       (where R 1  is a C 1-10  hydrocarbon group, a vinyl group, a methacryloxy group, or an organic group containing a mercapto group, an amino group, or an epoxy group; R 2  is a C 1-4  hydrocarbon group; R 3  is a C 1-8  hydrocarbon group or an acyl group; and a and b are each 0 or 1), a hydrolysate of the organic silicon compound, and a partial condensate of the hydrolysate. 
     
     
         8 . A coating liquid for forming a transparent coating film comprising:
 metal oxide particles; and   a matrix formation component, wherein   the metal oxide particles each include the metal oxide particle containing titanium oxide coated with silicon dioxide-stannic oxide complex oxide as claimed in  claim 1 , and   the matrix formation component includes at least one resin selected from the group consisting of a thermosetting resin, a thermoplastic resin, and an ultraviolet curing resin.   
     
     
         9 . The coating liquid for forming a transparent coating film according to  claim 8 , wherein
 the matrix formation component is a polyester-based resin or a urethane-based resin.   
     
     
         10 . A substrate coated with a transparent coating film comprising:
 a transparent coating film formed on a surface of the substrate by using the coating liquid for forming a transparent coating film as claimed in  claim 7 .   
     
     
         11 . A substrate coated with a transparent coating film comprising:
 a primer film formed on a surface of the substrate by using the coating liquid for forming a transparent coating film as claimed in  claim 8 ; and   a hard coating film formed on the primer film by using the coating liquid for forming a transparent coating film comprising:   metal oxide particles; and   a matrix formation component, wherein   the metal oxide particles each include the metal oxide particle containing titanium oxide coated with, silicon dioxide-stannic oxide complex oxide, comprising:
 a titanium oxide-containing core particle (A); and 
 a coating layer with which the titanium oxide-containing core particle (A) is coated and that is made of silicon dioxide-stannic oxide complex oxide colloidal particles (B) having a mass ratio of silicon dioxide/stannic oxide of 0.1 to 5.0, wherein 
 one or more intermediate thin film layers that are made of any one of an oxide: a complex oxide of at least one element selected from the group consisting of Si, Al, Sn, Zr, Zn, Sb, Nb, Ta, and W; and a mixture of the oxide and the complex oxide are interposed between the titanium oxide-containing core particle (A) and the coating layer made of the silicon dioxide-stannic oxide complex oxide colloidal particles (B), and 
   the matrix formation component includes at least one selected from the group consisting of an organic silicon compound of formula (1):
   R 1   a R 2   b Si(OR 3 ) 4−(a+b)   (I)
 
   
       (where R 1  is a C 1-10  hydrocarbon group, a vinyl group, a methacryloxy group, or an organic group containing a mercapto group, an amino group, or an epoxy group; R 2  is a C 1-4  hydrocarbon group; R 3  is a C 1-8  hydrocarbon group or an acyl group; and a and b are each 0 or 1), a hydrolysate of the organic silicon compound, and a partial condensate of the hydrolysate. 
     
     
         12 . The substrate coated with a transparent coating film according to  claim 10 , further comprising:
 an anti-reflective coating on the transparent coating film or the hard coating film.